Spaced parallel panel air diffuser assembly

ABSTRACT

An air diffuser assembly has a plurality of hat-shaped members which individually fit over individual parallel spaced panels of a suspended ceiling structure to locate upper and lower flange baffles of adjacent members in the spaces between the panels. The upper baffle or weir forms a throat between the free edge thereof and the vertical portion of the adjacent members to regulate the flow of air therethrough while the lower baffle acts as a vane to deflect the air flowing through the throat along the ceiling to be diffused throughout the room.

United States Patent Lambert V [4 1 Sept. 5, 1972 [54] SPACED PARALLELPANEL AIR 3,448,675 6/1969 Davies ..98/40 DL DIFFUSER ASSEMBLY 3,411,42511/1968 Lambert ..98/40 D 2,180,945 11/1939 Morey ..98/40 D [72] LambertGlendm 3,543,669 1/1970, Kodaras ..98/40 D [73] Assignee: Air Factors,lnc., Redlands, Calif. 3,366,029 1/1968 Reynders ..98/40 D [22] Filed:July 1970 Primary Examiner-William E. Wayner [21] Appl. No.: 53,449Attorney-Miketta, Glenny, Poms & Smith T [52] US. Cl. ..98/40 D, 52/496[57] ABSTRAC 51 Int. Cl. ..F24l13/06 An air difiusdr assembly has aplurality of hat-shaved [58] Field of Search ..98/40 D, 40 DL, 40, 114-,members which individually fit over individual Parallel 52/303, 496spaced panels of a suspended ceiling structure to locate upper and lowerflange baffles of adjacent 5 References Cited members in the spacesbetween the panels. The upper baffle or weir forms a throat between thefree edge UNITED STATES PATENTS thereof and the vertical portion of theadjacent members to regulate the flow of air therethrough while theJones D lo er bame acts a a a e to t i flowing 3,429,250 2/1969 Kodaras..98/40 D through the throat along the cellmg to be diffused 2,662,74312/1953 Frenger ..98/40 D X throughout the mom 3,185,067 5/1965Batchelor ..'...98/40 DL 3,277,622 10/1966 Jensen ..52/496 Y 7 14Claims, 4 Drawing Figures BACKGROUND OF INVENTION This invention relatesto air diffuser assemblies, and more particularly to such an airdiffuser assembly for a spaced parallel panel ceiling structure.

A popular design of suspended ceiling for a room has a plurality ofgenerally parallel spaced panels or slats mounted on a framework ofpanel carriers. The panels of such a ceiling are typically formed ofsheet metal with a flat central portion and return bent edges or roundedborders giving an elongated, generally U cross-section. The return bentedges form borders which define a plurality of generally parallelelongated openings through the ceiling structure which arearchitecturally pleasing to the eye. These openings may be used toprovide indirect lighting, ventilation and sound absorption for theceiling.

Heretofore, the ventilation provided by the elongated openings waslimited to providing pressurized conditioned air to the attic spaceabove the panels to the ceiling structure, with the conditioned airpassing through the elongated openings between the panels or slats andinto the room in a plurality of streams. The volume of air flow to theelongated openings was greatest at the source of pressurized conditionedair, and decreased as the distance from the source to the elongatedopenings between the panels increased. The air flow pattern caused bythe heretofore used method of ventilation gave the room a coldventilated area under the'supply of conditioned air with the ventilatedquality and the warmth of the air in the room decreasing as the distancefrom the supply of conditioned air increased. This type of ventilationis uncomfortable for the occupants of most areas of the room andtherefore is unacceptable for modern design.

The variations in room temperature across the room can be solved byproviding a multiplicity of air plenum chambers distributed on thesuspended ceiling structure in the attic to supply air through certainsections of the elongated openings into the room below, with return airreturning to the attic through other sections of such openings. Theprovision of the air plenum chamber divides the attic space between thesuspended ceiling and the real ceiling of the room into supply sectionssurrounded by the air plenum chamber, and return sections between theair plenum chambers for returning the air along the attic.

The mere provision of a suitable number of air plenum chambers however,does not solve the air dislocated in the opening between the panels tocooperate with each other to regulate and deflect the flow of airbetween the panels, to. provide such an assembly wherein such bafflesare flanges extending oppositely from adjacent panels, to provide suchan assembly wherein these flanges are mounted on a mount over the panel,to provide such an assembly with the members having a horizontal portionfrom which flange means extend into the opening between the panels, toprovide such an assembly with such members with an upper flange or weiron one side and a lower flange or vane on the other side, to providesuch an assembly with such members which individually mount overindividual panels, to provide such an assembly with such members whichcan be turned end for end to locate a different flange in a givenopening between the panels, to provide an assembly with such memberswith vertical portions that extend over the borders of respective panelsto hold the flanges thereof in the openings between the panels, and toprovide such members which are inextribution problem since air cannot bepermitted to flow Y in an uncontrolled manner down through the elongatedopenings between the borders of the panels or slats. Such uncontrolledair distribution would direct undesirable cold air streams directly downonto the room without creating an acceptable air flow pattern.

BRIEF DESCRIPTION OF THE INVENTION to diffuse air throughout the room.

pensive to manufacture, simple to install and effective Generally theair diffuser assembly according to this invention for use with asuspended ceiling structure having parallel panels with longitudinalborders spaced apart to define elongated openings between the attic andthe room therebelow, includes upper and 'lower baffles and meansmounting the baffles in anelongated opening, each with one edge adjacentthe panel and the free edge of the baffle in the opening adjacent thefree edge of the other bafile to deflect a stream of air from the atticbetween the free edges along and beneath the ceiling to be difiusedthroughout the room. The baffles may be flanges on flange means of ahorizontal portion of a mounting member'over each panel to locate theflanges in the elongated openings. The flange means may include verticalportions whose resilience holds the members to the associated panel. Theupper baffle may form a throat between its free end and the verticalportion of the adjacent panel to regulate the flow of air therethrough.The 'lower baffle may act as a vane to deflect the flow of air along theceiling.

Other and additional objects of this invention will i become apparentfrom the following detailed description and drawings in which:

FIG. 1 is a perspective view partially in section, of a portion of asuspended ceiling structure having parallel spaced panels or slats withan air plenum chamber thereover, and an air difi'user assembly accordingto this invention thereon;

FIG. 2 is a cross-sectional view taken along the plane lI-II of FIG. 1and showing the configuration of the panels of the ceiling and theconfiguration of the diffuser members of the air diffuser assembly;

FIG. 3 is a cross-sectional view of a side diffuser member for the airdiffuser assembly; and

FIG. 4 is a cross-sectional view of a central diffuser member for theair diffuser assembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to thedrawings and particularly to FIG. 1, the air diffuser assembly accordingto this invention is generally denoted by the number 10. The airdifiuser assembly 10 is located in a room 11 having an 3, attic space 12divided therefrom by a suspended ceiling structure 15. Generally thesuspended ceiling structure 15 includes panels or slats 16 mounted on aframework of panel carriers 22- secured to the ceiling by resilienthanger assemblies 25. An air diffuser member 30 for the panel 16generally includes a horizontal body portion'31 over the panel 16 andwith flange means 36 of upper and lower baffles 40 and 43 mounted to thehorizontal body portion. An air plenum chamber 50 is mounted in theattic 12 over several panels 16-between the panel carrier 22 on the airdiffuser members 30.

' As best seen in FIG. 1, each of the panels or slats 16 of theillustrative suspended ceiling structure 15 include a flat centralportion 17 with borders. 18. The borders 18 and return bent edges 19define an upwardly opening cavity 20. The return bent or rounded edges19 have apexes 21 which define the overall width of the panels 16 andthe width of the openings between panels as noted hereinafter.

The panel carriers 22 of the illustrative suspended ceiling structure 15have a generally hat-shaped crosssection and are joined together to forma framework. The lower edges of the panel carriers 22 have a pluralityof downwardly bent tabs 23 oppositely opening in pairs with suitablespacing to receive the return bent edges 19 of the panel 16 to locatethe panels on the panel carriers 22 in parallel relationship. Theborders 18 of the panels or slats 16 are spaced apart so that the apexes21 of the borders 18 define elongated openings 24.

A resilient hanger assembly 25 of the illustrative suspended ceilingstructure 15 hangs the panel carriers 22 from a real ceiling of the room11. The resilient hanger assembly includes a number of apertured hangets26 extending through keyhole openings 27 in the panel carrier -22 with aspring 28 hooked into the aperture in the upper half of hanger 26'. Theupper end of the spring 28 is threaded to a respective threaded ceilinganchor 29 anchored to the real ceiling of the room 11. The use of thethreaded ceiling anchor allows the spring to be threaded onto the anchor29 to change the height of the panel carriers 22 as needed for levelingthe structure 15 for accommodating different real ceiling heights, etc.

The air diffuser assembly for use with a spaced parallel panel 16includes a multiplicity of side air diffuser members 30 and some centralair diffuser members 130. Generally the members 30, 130 are identical indescription and so where the parts are identical, the same number willbe used to apply to both and where the members are similar but notidentical, the numbers will be separated by 100.

Referring now to FIGS. 3 and 4, the members 30, 130 have a horizontalbody portion 31 with an upper surface 32 and a lower surface 33. Thehorizontal body portions terminate on the right side at vertical portionupper edges 34, 134 and sn the left side at vertical portion-upper edges35, 135 respectively. Flange means, indicated generally at 36 and 136include vertical portions 37, 137 and 38, 138 extending downwardly fromthe baffle edges 34, 134 and 35, 135 to form hat sections 39, 139respectively. On the lower edge of each vertical portion 37 is anoutwardly extending flange or upper baffle 40. The flange or upperbaffle 40 includes an inner edge 41 integral with the lower edge of thevertical portion 37 and a free or outer edge 42. Likewise on the leftside, the member thereis provided a lower baffle or flange 43 with aninner edge 44 on the lower edge of the vertical portion'38 and a free orouter edge 45.

The center air diffuser member 130 as best seen in FIG. 4 is identicalwith the side air diffuser member 30 except that both of the flanges onthe vertical portions 137 and 138 are lower baffles or flanges 140. Thebaffles or flanges thus described may be mounted to the panels by theassociated horizontal and vertical body portion, or mount, as seen inFIG. 1.

The spacing between the vertical portions 37 and 38 of the flange means36 of the horizontal body portion 31 is slightly less than the spacingof the apexes 21 of the borders 18 of the panel 16. The air diffusermembers 30, 130 mount over the panel 16 by spreading the verticalportions 37, 38 causing the vertical portions 37, 38 to engage theapexes 21 of the panel 16 to hold the air difiuser members 30, 130 onthe respective panels 16. 7

When the air diffuser member 30 is on the panel 16, the flanges 40 and43 are located in the elongated openings 24 on either side of therespective panels 16. As seen in FIGS. 2 and 3, the members 30 arearranged so that an upper bafile 40 is provided from one member 30while'a lower flange or baffle 43 is provided for the adjacent member30. The lower bafiles 43 are spaced slightly above the plane of centralportion 17 of the panels or slats 16 with the upper baffles 40 spacedslightly above the lower baflles 43 in the elongated openings 24.

As best seen in FIGS. 1, 2 and 3, an air plenum chamber 50 is providedover selected panels 16 of the suspended ceiling structure 15. The airplenum chamber 50 has walls 51 of ductboard covered with sheet metal.The walls 51 extend between the panel carriers 22 and over severalpanels .16. On the lower ends of the walls 51 are sponge gaskets 52which seal the walls 51 to the upper surface 32 of the horizontal bodyportion 31 of the air diffuser members 30, and to the panelcarrier 22.As is customary, the air plenum chamber 50 has an inlet 53 and adownwardly facing outlet 54 to direct conditioned air from the plenumchamber through the elongated openings 24 between the panels or slats 16thereunder. The air plenum chamber 50 divides the elongated openings 24into supply sections 55 thereunder with the openings 24 between the airplenum chambers 50 acting as return sections 56 to return the air to theattic 12 outside of the air plenum chambers 50.

A central air diffuser member 130 is provided over the panel 16 which iscentrally located under the outlet 54 of each air plenum chamber 50.Adjacent the cen-- tral air diffuser member 130 are located side airdiffuser members 30 with the flange or upper baffle 40 extending towardthe center air diffuser member 30.

The vertical portions 37 and 38 of adjacent members 30 in a particularelongated opening 24 define a diffuser inlet 60 below the outlet 54 ofthe air plenum chamber 50. The diffuser inlet 60 terminates in a throat61 formed between the free edge 42 of the upper bafile 40 and thevertical portion 38, with the upper bafile 40 acting as a weir torestrict the flow of air through the throat 61. The air from the throat61 strikes the lower baffle 43 which acts as a vane to direct the flowof air past its free edge 45 and along the central portion 17 of thepanel or slat 16 in the direction the lower baffle 43 extends, to bediffused throughout the room 11.

The side difiuser members 30 on the right and left of the central airdiffuser member 130 are identically constructed as is shown in FIG. 3.The side air diffuser members 30 are turned end for end, depending onwhat side of the central air diffuser member 130 they are to be located.This arrangement of the members 30, 130 deflects the air both ways fromthe central member 130.

If air is to be deflected in only one direction from each of the plenumchambers 50, the central member 130 is omitted and the side members 30are mounted with the lower baflles 43 thereof extending in the directionof the desired air flow. Various air flow patterns can be obtained, evenopposite air flow paths from the same opening under a single air supplyplenum,-through the positioning of the within disclosed diffuser members30 and 130 on the associated panels or slats.

It should be readily apparent that if the panels or slats 16 weredifferently shaped or constructed out of a different material such aswood for example, the members 30, 130 could also be differently shaped.The important feature of this invention is to maintain the relationshipof the upper and lower baffles 40 and 43 in the elongated openings 24 toprovide a diffuser inlet 60, the weir defining the throat 61 and thevane for deflecting the air along the underside of the ceiling structure15.

It should be noted that the appearance of the upper and lower baffles 40and 43 in a particular elongated opening 24 is architecturally pleasingin appearance since the opening 24 appears from below to be solidlyfilled with a dark contrasting panel structure. The space between thefree edges 42 and 45 of the baffles 40 and 43 does not show because ithas as a background the dark inside of the plenum chamber 50 thereover.Thus by the provision of the upper and lower bafiles 40 and-43 of themembers 30, 130 of the air diffuser assembly of the invention, theelongated opening 24 between parallel panels or slats 16 of thesuspended ceiling structure is architecturally pleasingly filled whilesimultaneously passing conditioned air through the supply section 55 to'be diffused in either lateral direction from a single opening throughoutthe room 11 before returning through the return sections 56 to the attic12.

I claim:

1. The combination comprising a suspended ceiling structure havingparallel panels with longitudinal borders spaced apart to defineelongated openings between an attic thereover and a room therebelow, andan air difiuser assembly including:

upper and lower baffles, the baffles together having an aggregate widthapproximating the width of an elongated opening, and

means for mounting the baffles on the ceiling structure in verticalspaced relationship, each of said baffles having one edge thereoflocated adjacent one of a pair of longitudinal borders defining anelongated opening with the opposite free edge thereof positioned in saidopening in vertical spaced relationship to the free edge of the otherbaffle, said mounting means including first and second baffle mountingmembers, each having a pair of oppositely extending baffles securedthereto, each of said members in a first position locating one of suchbaffles in an associated opening as an upper baffle and in a secondposition locating the other of said baffles in said associated I openingas a lower baffle, a stream of air from the attic being deflected by thecooperation of the baffles to be directed along and beneath the ceilingstructure to be diflused throughout the room.

2. The combination as in claim 1 wherein the mounting means members eachinclude a body portion extending over an associated panel and between aspaced pair of vertical portions, each portion mounting a baf- 3. Thecombination as in claim 2 wherein the panels are hollow with roundedlongitudinal borders, apexes of said rounded borders defining saidelongated openings, inwardly'facing edges of said'borders defineupwardly facing cavities and each of said members is located over anassociated panel and the longitudinal borders thereof.

4. The combination as in claim 3 wherein the vertical portions of saidmembers extend downwardly from the body portion giving a hat-shapedsection to the members and wherein the spacing between vertical portionsof the members is less than the spacing between the apexes of theborders of the associated panel, said vertical portions being spreadableto position the members over the associated panel borders, theresilience of the members holding the member to the associated panels tolocate the associated baffles in the associated opening.

5. The combination as in claim 2 wherein the baffles comprise outturnedflanges on the vertical portions of the members.

6. In combination with a suspended ceiling structure having parallelceiling panels with longitudinal borders spaced apart to defineelongated openings through which air flows between an attic spacethereover and a room therebelow, an air diffuser assembly comprising:

an opposed pair of air deflecting baffles and mounting means foreach'baffle of said pair, including a body portion to which theassociated baffle is secured and which is positioned on and supported bythe top of an adjacent panel, for locating the pair of baffles in anelongated opening, said pair of baffles cooperating to deflect a streamof air passing through the elongated opening to be diffused throughoutthe room beneath the ceiling structure.

7. In combination with a suspended ceiling structure having parallelceiling panels with longitudinal borders spaced apart to defineelongated openings through which air flows between an attic spacethereover and a the baffle in an elongated opening adjacent the,

panel to deflect a stream of air passing through the elongated openingto be diffused throughout the room beneath the ceiling structure; andwherein an opposed pair of baffles are provided for each is providedforeach baffle of the pair, said pair of baffles cooperating to deflectair along and beneath the ceiling structure; and wherein each mountingmeans mounts both a first baffle and a second baffle thereon, each saidmounting means in a first position on a panel locating the first bafilein an associated elongated opening and when shifted into a secondposition on the panel locates ture having parallel ceiling panels withlongitudinal borders spaced apart to define elongated openings throughwhich air flows between an attic space thereover and a room therebelow,an air diffuser asthe second baffle in the respective elongated opening.

8. The combination as in claim 7 wherein the mounting means locates thesecond baffle in a second adjacent elongated opening when in said firstposition and locates the first baffle in said second adjacent elongatedopening when in said second position.

9. The combination as in claim 7 wherein said bafiles each comprise anout turned flange provided at a lateral edge of said body portion.

10. The combination as in claim 9 wherein a first out turned flange atone edge of said body portion is vertically spaced from the top of thepanel a distance greater than the spacing of a second out turned flangeat an opposite edge thereof is spaced from the top of the panel, saidout turned flanges being thereby located at different vertical positionsin the associated elongated openings.

11. The combination as in claim 9 wherein the mounting means includesgenerally vertical portions mounting the flanges to the respective edgesof the body portion, said vertical portions being spaced apart less thanthe distance between the borders of a panel and being spreadable toreceive the panel therebetween the resilience thereof holding themounting means to the panel and locating the flanges.

12. In combination with a suspended ceiling strucsembly comprising:

a first and a second baffle positioned in one opening of said elongatedopenings by, first and second mounting means on adjacent panels to forma diffuser opening between the adjacent edges of the baffles to direct astream of air therebetween and generally along the underside of one ofthe panels, each said mounting means including a body portion to whichthe associated bafile is secured and which is positioned on andsupported by the top of an adjacent panel.

13. In combination with a suspended ceiling structure having parallelceiling panels with longitudinaly borders spaced apart to defineelongated openings through which air flows between an attic spacethereover and a room therebelow, an air diffuser assembly comprising:

an air deflecting baffle;

mounting means including a body portion to which the bafile is securedand which is positioned on and supported by the top of a panel forlocating the baffle in an elongated opening adjacent the panel todeflect a stream of air passing through the elongated opening to bediffused throughout the 00m benea the ceil'n stru ture' and a bottomopen i ng air pl erum c amber seated upon the body'portion and over theelongated opening for supplying air therethrough.

14. The combination as in claim 13 wherein the air v plenum chamber hasside walls defining the bottom opening and wherein air seal means areprovided along the bottom edges of the side walls.

1. The combination comprising a suspended ceiling structure havingparallel panels with longitudinal borders spaced apart to defineelongated openings between an attic thereover and a room therebelow, andan air diffuser assembly including: upper and lower baffles, the bafflestogether having an aggregate width approximating the width of anelongated opening, and means for mounting the baffles on the ceilingstructure in vertical spaced relationship, each of said baffles havingone edge thereof located adjacent one of a pair of longitudinal bordersdefining an elongated opening with the opposite free edge thereofpositioned in said opening in vertical spaced relationship to the freeedge of the other baffle, said mounting means including first and secondbaffle mounting members, each having a pair of oppositely extendingbaffles secured thereto, each of said members in a first positionlocating one of such baffles in an associated opening as an upper baffleand in a second position locating the other of said baffles in saidassociated opening as a lower baffle, a stream of air from the atticbeing deflected by the cooperation of the baffles to be directed alongand beneath the ceiling structure to be diffused throughout the room. 2.The combination as in claim 1 wherein the mounting means members eachinclude a body portion extending over an associated panel and between aspaced pair of vertical portions, each portion mounting a baffle.
 3. Thecombination as in claim 2 wherein the panels are hollow with roundedlongitudinal borders, apexes of said rounded borders defining saidelongated openings, inwardly facing edges of said borders defineupwardly facing cavities and each of said members is located over anassociated panel and the longitudinal borders thereof.
 4. Thecombination as in claim 3 wherein the vertical portions of said membersextend downwardly from the body portion giving a hat-shaped section tothe members and wherein the spacing between vertical portions of themembers is less than the spacing between the apexes of the borders ofthe associated panel, said vertical portions being spreadable toposition the members over the associated panel borders, the resilienceof the members holding the member to the associated panels to locate theassociated baffles in the associated opening.
 5. The combination as inclaim 2 wherein the baffles comprise outturned flanges on the verticalportions of the members.
 6. In combination with a suspended ceilingstructure having parallel ceiling panels with longitudinal bordersspaced apart to define elongated openings through which air flowsbetween an attic space thereover and a room therebelow, an air diffuserassembly comprising: an opposed pair of air deflecting baffles andmounting means for each baffle of said pair, including a body portion towhich the associated baffle is secured and which is positioned on andsupported by the top of an adjacent panel, for locating the pair ofbaffles in an elongated opening, said pair of baffles cooperating todeflect a stream of air passing through the elongated opening to bediffused throughout the room beneath the ceiling structure.
 7. Incombination with a suspended ceiling structure having parallel ceilingpanels with longitudinal borders spaced apart to define elongatedopenings through which air flows between an attic space thereover and aroom therebelow, an air diffuser assembly comprising: an air deflectingbaffle; mounting means including a body portion to which the baffle issecured and which is positioned on and supported by the top of a panel,for locating the baffle in an elongated opening adjacent the panel todeflect a stream of air passing through the elongated opening to bediffused throughout the room beneath the ceiling structure; and whereinan opposed pair of baffles are provided for each elongated opening andwherein a mounting means is provided for each baffle of the pair, saidpair of baffles cooperating to deflect air along and beneath the ceilingstructure; and wherein each mounting means mounts both a first baffleand a second baffle thereon, each said mounting means in a firstposition on a panel locating the first baffle in an associated elongatedopening and when shifted into a second position on the panel locates thesecond baffle in the respective elongated opening.
 8. The combination asin claim 7 wherein the mounting means locates the second baffle in asecond adjacent elongated opening when in said first position andlocates the first baffle in said second adjacent elongated opening whenin said second position.
 9. The combination as in claim 7 wherein saidbaffles each comprise an out turned flange provided at a lateral edge ofsaid body portion.
 10. The combination as in claim 9 wherein a first outturned flange at one edge of said body portion is vertically spaced fromthe top of the panel a distance greater than the spacing of a second outturned flange at an opposite edge thereof is spaced from the top of thepanel, said out turned flanges being thereby located at differentvertical positions in the associated elongated openings.
 11. Thecombination as in claim 9 wherein the mounting means includes generallyvertical portions mounting the flanges to the respective edges of thebody portion, said vertical portions being spaced apart less than thedistance between the borders of a panel and being spreadable to receivethe panel therebetween the resilience thereof holding the mounting meansto the panel and locating the flanges.
 12. In combination with asuspended ceiling structure having parallel ceiling panels withlongitudinal borders spaced apart to define elongated openings throughwhich air flows between an attic space thereover and a room therebelow,an air diffuser assembly comprising: a first and a second bafflepositioned in one opening of said elongated openings by first and secondmounting means on adjacent panels to form a diffuser opening between theadjacent edges of the baffles to direct a stream of air therebetween andgenerally along the underside of one of the panels, each said mountingmeans including a body portion to which the associated baffle is securedand which is positioned on and supported by the top of an adjacentpanel.
 13. In combination with a suspended ceiling structure havingparallel ceiling panels with longitudinaly borders spaced apart todefine elongated openings through which air flows between an attic spacethereover and a room therebelow, an air diffuser assembly comprising: anair deflecting baffle; mounting means including a body portion to whichthe baffle is secured and which is positioned on and supported by thetop of a panel for locating the baffle in an elongated opening adjacentthe panel to deflect a stream of air passing through the elongatedopening to be diffused throughout the room beneath the ceilingstRucture; and a bottom opening air plenum chamber seated upon the bodyportion and over the elongated opening for supplying air therethrough.14. The combination as in claim 13 wherein the air plenum chamber hasside walls defining the bottom opening and wherein air seal means areprovided along the bottom edges of the side walls.